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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a01b70adf70dedef436b7fb33279304f11a17d04a9dcc093aa9f1530a05e9f' 
  AND token = 'G6uU/pVailqz3XXqjTgk7hc6swx7Sc/wUXUKc0I9Ils=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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