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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca24246bd6708e522665b7255345abb3163f4eb6a93358aa7bfaf4edf1ac87c6' 
  AND token = '/bhN20zBx795WFrma8g2crJWNF4MtcRMIOonOoeIA1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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