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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0765c6f852823a7c76217d55ce92f2eb11e0bad7e0b0bdfc0353ddadbd88dfb4' 
  AND token = '4hWQ0xvsMI9xhcrYvO9rOrLs5p1HGyRiy2M9SQ9y2Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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