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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b84c20239377fab026ec3cf45b7dde913408ddd6368471fdd844e0511c61d20' 
  AND token = '+4Fg2H0o7xf80EBDGeZBmwDMap+DDO6Ay1DPSXqZv7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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