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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94d453b0a9551007d0cb18638a1e5554bec4973819b833a11325034171a5da6' 
  AND token = '4d5fhDbQak646RIbqTrouA2suaALk71qYF/3lwnON4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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