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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951234aae8d0c7a91769f906704d934f617ed95ad95a5bb706753e282de71dd4' 
  AND token = 'NPx/Yjr3YkPt7CMyJXVJLtK8xc1zxg5gE4gmFFI7t40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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