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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634d0db55b6c9ae6d4cb71f1c2b42e4a64a09a472d0a914626903a791d9485b4' 
  AND token = 'khFzziQtQl7saouTd/uW9wppDRcUVCN3TmbW4zoUEsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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