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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4206f1b60823e0af058449b025ddc0b01acf4d5cf5aee6ecb9027b5c4cf1eb88' 
  AND token = 'akr35iqb3WWemPH4lpTGd86MrYa1erapmRGu5zHVbRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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