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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b34ff9a217a56fa3b542e9082187086c11809b0e112d845fe8d8d619eb1670' 
  AND token = 'zSD2AYb8wDCWnB70I0KNaGKmUG0/bcJCA5AnBv1Z83M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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