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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909a677443f894e1b1e10e1cae9eb1ab955facca97979db152b85dd355bed786' 
  AND token = 'nD8G6Iwhd86npylqzy9tsNiRhmhb68QOYm9/7AbycD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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