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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9bd711b71862b5f25cb34abc2ac300b4fbfc167b04185d83cb656f10a19d2f' 
  AND token = 'p35iFuQzV52jcNQs5nY556z2bgBacikFUhXOK3ObERo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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