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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c035b3e46161494b5a7fe14cf4249a7fdb652634bb0753ba51f7eb91755019e4' 
  AND token = 'oqNQx71xLn78g1LwI13aVnSP1MVzoPega/FZ/ayYHMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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