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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c14e4408099e538f6227b2a724b30e1d8748cce09a884c4fcdd03eaa8de5a5b' 
  AND token = 'gN8Seg4I9u7Lqbh7DtjoYhNlWQgliquMzJSf0wj1dfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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