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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e9664bbd5ab8ea7f6fb0840ad2bb9b5af38e51983651fb711e4a370aa6c598' 
  AND token = 'onkSziLn7xGq45H1/zScF9NASHkDM2SHeSvwEg1H4Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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