Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80a4dcf407617b9e9007781bbad2035def798d6c109d74d29d409311636cb1c' 
  AND token = '9VipO9x861+DBwdY7zMWZQjzE8m83qx5QmE4KGiq/vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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