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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84108a69a94e45cc8544f490efef1d29c9c15632647ee550f7963f0163d0fa9f' 
  AND token = 'wau7FiY5DqIW1GOPzsL8O2wGNew7sk52nDkJFg0vhRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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