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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92de232322168aaacb0d51dc8b2b81fd708911893ed79f2ae5b580c730bc458e' 
  AND token = '6kr9hzSu+Gf8ynOCXUaTvyeX9vMcB7ZxJ9gG+9OU5Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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