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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eae71c7928e004bc00e126d14dca81b67b75a807ae93ac9bef858df2eb87e32' 
  AND token = 'J2QfC4wk4AAeEhdjzG2ANP81xxHnjqjz9jNtzxeD/Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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