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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1140a60261f756a20de18a8c51891ab8058c0902f721c15d09a5e0cbc148c37' 
  AND token = '4NcJmC9RCJAJx3bax6Ap3YZY5t5H8mTwNDMuwnx3m3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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