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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c97205483ad48c6bbd1b555141ed8913ce896ceb6c8c948db6146434a6c745e' 
  AND token = 'Tc78n4o5aMEPlTRWNCnRkIYyVeimQm9e7CZWvPHcGUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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