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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a90376f8bf06302d64a10e497ae520e511593df9d6223b2e45c4ffee96d732' 
  AND token = '+jx3Cj5R5KrhVMQvoCOLUxPV6EEw6MvNi9aIYWbeZkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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