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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346b70d4b532733400eaa4e9bc9f6617d4454ab8b5fdb67b64cd7ffab89c942c' 
  AND token = 'SAl/YFyym6fAIgGHLD1flHvm47iSyj1g6nW7bL+0c/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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