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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b2f06561f8041d3399c52d1de4885b276c6db9a14879609c32b0c21769d7c0' 
  AND token = 'LZAurZSLWbkxfDO07fhamP3fh3WVWpIrGtbxU56OHOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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