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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69aaeeac802c9d057e2206417b4ede6d429d1e1c8c3b58c73dca92e5b977160b' 
  AND token = 'oVnqQqOtul91wfMWVEEIwmTtobC5JUD+ZDlmNu8E2VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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