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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbe159770a357cecdff7424c74a5ab8e2a64c18ffd7c39b1355487e29f9c84f' 
  AND token = 'D1NjlWaIvAs0M4QmyFL1AgJt7pxRWdRc6ZKXohmL0vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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