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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885cb5690b6d6b138674f09659023704ab723e27a1c483d8bff18bd2808998f3' 
  AND token = 'iOd6kaQaf9/pCugRX8lxsg70d79r/CvYbiiH2znEzy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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