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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bb86585b40224a2a543510c07ed85c1a8d5874699664d5da0184b6b4632c4f' 
  AND token = 'aGDS/XHVji5nrlcN0uk7ftLqjVsr9bYm1W5NImqGSho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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