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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97d0bcf013710befb47dd132d4ff34c16083ab1064e0703ab69db4c0db5173f' 
  AND token = 'QorwQ7xJ3eQE0Kr5FecSlYHb4/TTK+0ZzfbP34FS/DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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