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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a399cdbfba92a10a6026c977d817fe546f38619f3d036f84da872a3ead4a2f' 
  AND token = 'yurhKu4PGVYvN1ABpDuGrr8i+ugJyirW3rIXoCNTPJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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