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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096aeb1c9424e5f69d90907ea815203e40848b6b5be5527b66e81eb7f61f2596' 
  AND token = 'htXxOG1LdWzwmLc+5vFXT5hB+ttRfynYvekV8l5Z0cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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