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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cae1e6d601d9604e6a91eaad0a05ee8a868699b5927b34b68913cb6ef465f8' 
  AND token = 'BFU/bI2FIESO8ru1AjmsAkHi3LwDrypXJE5LfGAvXSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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