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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cd44d8bcc4ac2b48e6a7c9850e95654f11a5a9d4b0c3b7f0592085c98aa999' 
  AND token = 'HW0VNqe1FUQFJlDLHwFOKLrXt6ux2f2TMEULPp31XDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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