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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd308ca8f3e2eb53d46fcc754cc343fc8b06368df150374a0349ee6be4a47e0' 
  AND token = 'kYmJFb5DDAVdir/B4zNcMxospBDBBiTED8NdO0bfve4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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