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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f307ed1dc29d3e07f2afff6dae9f849bed8640331971ce4e2f4ee37b98c3f2' 
  AND token = 'Y5+VxcKjOfUsCnOYigU+OSZa4UcHd9DTCLFKKAS3zBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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