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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f81d318589a1c4558354284de92f9edd7c6dcddae14d46582a4e6fdb617d74d' 
  AND token = '4LlIQ9unwRHZ7zxqDHU701l0/4V0ekZlRpcKAizboVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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