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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecacdd03f30fc334eec9d8d04763daabf7866571e1968bb4a5be477e18811f3' 
  AND token = '1hX4BWqsL1KH9Mqmzm/dF45SauWgYQnYOk53IApMwAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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