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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b93e108299c6fff05858ad7e482c92f720eb2c816f97d6b79ae157c6252707' 
  AND token = 'AxqdKRi8L+AAcAMRnAELeWchoL+EYmtYTspRUczaA7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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