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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045bf215d7f96e61ed7ce5f9cb20a7075f7666002db02bfdb52143e4d8331208' 
  AND token = 'I3YXZmxqGAylPNC3jXWb2q81TVq41rX/kv5gUs4gfoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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