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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a40d4106c8b01ec4e80b40df92f6173562180ffe1ca2bf98e49b029c9b7c6f' 
  AND token = 'Kg9K9MHFF88esRW0yiuHVv60rvu3encYix0LGiDERGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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