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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8d9eb9f76b84b7b6e5eaa4de630a7665438b3f01dd6bcad9cb631586151ec6' 
  AND token = 'GnRKcS+TNZJoOe+yyEHd3zRIVUBt/Us7Cww2fdciRys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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