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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9ccd32ad5928ee1c2f5cb3aafce5aa473104f8eef068b6ba70bd5426030d25' 
  AND token = 'hq1u4URi++1evAb8b5WpSJeoKQ7HN7rF3J3gswgpCeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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