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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4949d35f578e2b24ffb79c1e22de34a1cfe8fbaef2dcd68e5f410637a4598b6' 
  AND token = 'p+JZeB1wuX8xyyrkH3beKO412xC8/EzZhl4eWWllA+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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