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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4264270a4aecf85c1ebbf5d389ab794cb09869f3436d2c7c55eef322534d317a' 
  AND token = 'Bgpv5UxeSE/z6Yu0Vukgxa1ABUXk118hdy9mfsF+3Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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