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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda6a40c4d991b392016b5d8313b7afe2cf3d4a93f7de767b13005439eb4b7b4' 
  AND token = 'djrGTS1qIwKsrLXism1ro/mf2f1ylWMhew4nwJlq/KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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