SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98002723bf33723723804d2b5ad9319b96f67d6f0a96a7528896795777b345b6' 
  AND token = 'TRmy+gUJ/AsPUQq9vfrLIX2KSiD9HIvjA6q+obG0q5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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