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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53add0e1d626ad5b5fc246218114875cafcce8a3ca99616b92c613a5590f95bb' 
  AND token = 'KWDHTrr4+PqXk/n2fE+q1kQCk3VzXVc6AF9+SJqvUkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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