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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085e378d4397a41491d192a070e327bf3af7ee9fec07b1d90e9f2c731d6d920a' 
  AND token = '7/eS1y1BvU01d8HDNQ6Wz/hutFd7WxdRBma1lX/YoAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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