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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210b864cdf4d9e413f4dbe206ffd428ed7f8dd695be1005496209cfe5fdc771e' 
  AND token = 'cA5nkXiRnKjLaW6CLvHknxNCx7NGgA7o2/A4YaGqHF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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