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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e92fe752de5759c6f7f4dd0bc362d0e828dc99225628e622691c51106071377' 
  AND token = '20M90I/hwv2P5LUU3O41dTqPT5ptV7AxYuGcPS0mAUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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