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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60be5dae0690e7d6029e41907126efb8817c9bef3f4eba25999ac15d57f77592' 
  AND token = '0Ffd+eVYl/ERq9xpWnMmwkTiztniSXFIeik3w8n7wrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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