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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3465c30488e0045646524c4ce25cf08a821e00a7f74f8a571541ae9886332ee2' 
  AND token = '/oZjruQBE3fs0Z9Z6SOEHubhfG8d4ZuFmAqQOG1xYaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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