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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d0192a236cc5ed059b9c7a312cc58cd929c7bcc7f68b7d99a1aeda0b668d15' 
  AND token = '3RVRIgZ8sZnFtOXJIok7iRc/hrLVoZQ3i9gnh6vvv78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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