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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3905b5ba0967312d18906b8b38eb6587b530e4477402556af8614cbc116afc8' 
  AND token = '+dNs7OD8Z9FZ163UMDWb8mR64B/q9b9dr7QCAgV+ATY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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