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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c7a853ab88f2b5c3eabfa9d28eb68881b5174b3bb4e34d6de5d67c955e4456' 
  AND token = 'AXxJAW+bq5B/Iox8thX5Bd2kioQI8B2GW8cTYG0shoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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