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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36d1374e21ab0c89052cd171579b99dc0bcb1bd1afa1b347c1d1f8d7b55b942' 
  AND token = 'FTVYGu0JoYEw7oraIax3cZLv/hYXWxb/xn2WEdhpsWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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