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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfefcceb74d8e57c4cccd3548cac6ad162ece9f0ac594e4fab1c89038767314' 
  AND token = 'Wkn0qo4Td/JC3M3vQUID6C+CNVtwEbN8WXGzOiBlAmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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