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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf4747e52d8acff98bb0e555be86fa5d372a55b01c93768612d3674cfd33cd1' 
  AND token = 'F9R58OuLB7f2P9+rf883KowFz3y+u9zYqTm7LxShBFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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