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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd274e1e56ce07ffc09a531b8988de5c9c71898ed340133e891da33a780300ea' 
  AND token = 'ealE0K8fxnfBGApuGG248Fu75cL3hw2hOe9Zi7abUis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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