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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879266f190c9900045054b7a8d0671a63a4be8b77e6e5eb2d4d98c61c6ef3caa' 
  AND token = 'a8kURmeyyKijBTH6mw8EWo1CScVWHdjOxcyzzUyOps4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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