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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fab9b9eba3ee787b854fb101037d7d405677caa3a1fd765effad3642f048bc' 
  AND token = 'R/s7F5D29DiTTY+fk8lFinlt1syfQRHIYMZNxL7+LU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}