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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666ad9da441a99ba7eaae0f1d83c86e3dc755351f663da44877e32e0c9534fd3' 
  AND token = 'Zogi5HgKeiQssRIY4UuvLnV+P9+8bONhZYZPkSL+yno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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