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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc9a6aec79f8eab247e918e583ce41fb4f7d7fb94ce16eb6528bbd12f6d4c58' 
  AND token = '/5cqWxutqdxny0djxqKhKE3e6Qkf/qQV4ze1eQznIpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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