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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e335e7a5509484f83e58ac1fbcbfbaf54a01a14e7a8816854b4cc15acce0466' 
  AND token = 'jtdByRoP7sEiEQLkFi942nwFIqJXB12fy7Vmwj7xmPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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