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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e75a0227e6044487a7de469dfcb5976ab4254b91c7bef63a3334406d112d21' 
  AND token = 'ZgzauksnUy0N3jW9Ize3WDEVYQocNbEa6KuL6exikPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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