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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adf8cab3c5f34662b6ae8be131a6e2356cd0cc855b893817e32d4c416953a17' 
  AND token = 'eFTVUZ2EzfPRjUMZhMaXOnXPSDHST7ka8alGS6Po6Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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