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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1dc9f4ce84d40196a53c3d438c3ce003ea6f88066af54456a90e1ed219278a' 
  AND token = 'eXRlZCgXwKVIDdMCtElSDyXLS1LQAMTO/AnIf80l7VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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