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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cbef69fddbf2286c6243238b4ab89aefcfec372a5e178a9d65f31770b5a91b' 
  AND token = 'dBTDOI8HXk4d5BfrIOhSEBRN+HuSLeAuiAlLiDdunFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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