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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a91d5a761cc13343223249a4ee99581c684265147bccf6016d33d915956a32' 
  AND token = 'eW9uHW0gStd6UiZm6UfUUNeaIeLjSuOb8FvQ3Y9NEhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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