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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e594424f99e84d287c5b7f2323e0d693337f07589acda3ced8eec1e463e1d631' 
  AND token = 'QsLLwWJ/OdSswONfW3PRYIHYGHx02C9b/zi3yGVN+l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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