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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff0f4cf636872ff0d05e3f7de1f067cb7c7446c1d84706e3fd2948a87a8f8d7' 
  AND token = 'R7zna/mD1HrqzKwGIbufL58X/8En5iU17MPkjNDN/sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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