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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cf700bf88d0a2ddf36493be33b14a84a466f632ac1ea613d1b568f510d79d2' 
  AND token = 'UxD2fhjgdc0AoHb+WDu5BbZJStCA0xHe0exn7fj8Abo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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