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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8af42a89ac885e38ace0b4ad4e0eb369e4893f17603c072404d4f38b21ccd3' 
  AND token = '3s83CQwbH/M0F/AqoAMlPpaqB8+9pA9Srau2CdpqOb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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