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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d10d412999d2dce617f890ba06aee53082a41c2b14fca5959c833bd3752ddce' 
  AND token = 'knvjT+shTCSLHcJPU8EqRnECYSlxYsRfEZLZMvFSIEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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